* given the same package style/size, use as large as
capacitance as available (i.e., decreases impedance)
* use the smallest package size that you can (i.e.,
extends usable frequency range)
Pat
On Mar 17, 9:39am, Vinu Arumugham wrote:
> Subject: Re: [SI-LIST] : A Question About Power Noise.
> Mark,
>
> Is a low value of capacitance really important? At 1GHz+, the package
inductance dominates the characteristics and so the impedance of a 0.1uF and a
100pF capacitor in an 0603 package will not be very different. As you point
out,
> for better performance at higher frequencies one would need a lower
inductance 0402.
>
> Thanks,
> Vinu
>
> Mark Randol wrote:
>
> > SMT 0603 ceramic caps are still pretty good at 1GHz+ as long as you keep
> > the value under a couple 100pF. 0402's go up through a couple GHz.
> >
> > --
> > ---------------------------------------------------------------
> > Mark Randol, RF Systems Engineer | Motorola SPS, Inc.
> > (602)413-8052 Voice | M/S EL379
> > (602)413-4150 FAX | 2100 E. Elliot Road
> > [email protected] | Tempe, AZ 85284
> > ---------------------------------------------------------------
> >
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>-- End of excerpt from Vinu Arumugham
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